private int maxColumnLength; // the setting defined column length.
public ColumnEvaluator(Type datatype, Comparer comparertype, IComparer <byte[]> bytecompare, byte[] valuebytes, int columnlength, int maxcolumnlength)
{
this.DataType = datatype;
this.compareType = comparertype;
this.byteCompare = bytecompare;
this.ValueBytes = valuebytes;
this.columnLength = columnlength;
this.maxColumnLength = maxcolumnlength;
if (this.DataType == typeof(DateTime))
{
this.TargetDate = DateTimeUtcHelper.ToDateTime(this.ValueBytes);
this.IsDateTime = true;
}
if (this.DataType == typeof(string))
{
this.TargetString = System.Text.Encoding.UTF8.GetString(this.ValueBytes);
if (this.TargetString != null)
{
this.TargetString = this.TargetString.Trim('\0');
this.TargetString = this.TargetString.Trim();
}
this.IsString = true;
}
}
/// <summary>
/// test column value match the condition.
/// </summary>
/// <param name="columnbytes"></param>
/// <returns></returns>
public virtual bool isMatch(byte[] columnbytes)
{
if (columnbytes == null)
{
return(false);
}
if (this.IsDateTime)
{
var coltime = DateTimeUtcHelper.ToDateTime(columnbytes);
return(DateTimeUtcHelper.Compare(compareType, coltime, this.TargetDate));
}
else if (this.IsString)
{
var currentValue = System.Text.Encoding.UTF8.GetString(columnbytes);
if (currentValue != null)
{
currentValue = currentValue.Trim('\0');
currentValue = currentValue.Trim();
}
return(Helper.StringHelper.Compare(this.compareType, currentValue, this.TargetString));
}
else
{
switch (compareType)
{
case Comparer.EqualTo:
return(this.byteCompare.Compare(columnbytes, this.ValueBytes) == 0);
case Comparer.GreaterThan:
return(this.byteCompare.Compare(columnbytes, this.ValueBytes) > 0);
case Comparer.GreaterThanOrEqual:
return(this.byteCompare.Compare(columnbytes, this.ValueBytes) >= 0);
case Comparer.LessThan:
return(this.byteCompare.Compare(columnbytes, this.ValueBytes) < 0);
case Comparer.LessThanOrEqual:
return(this.byteCompare.Compare(columnbytes, this.ValueBytes) <= 0);
case Comparer.NotEqualTo:
return(!Btree.Comparer.ByteEqualComparer.isEqual(columnbytes, this.ValueBytes, columnLength));
case Comparer.StartWith:
return(Btree.Comparer.MoreComparer.StartWith(columnbytes, this.ValueBytes, this.columnLength));
case Comparer.Contains:
return(Btree.Comparer.MoreComparer.Contains(columnbytes, this.ValueBytes, this.columnLength, this.maxColumnLength));
default:
return(false);
}
}
}
/// <summary>
/// test column value match the condition.
/// </summary>
/// <param name="columnbytes"></param>
/// <returns></returns>
public virtual bool isMatch(byte[] columnbytes)
{
if (columnbytes == null)
{
return(false);
}
if (this.DataType == typeof(DateTime))
{
var coltime = DateTimeUtcHelper.ToDateTime(columnbytes);
return(DateTimeUtcHelper.Compare(compareType, coltime, this.DateTimeValue));
}
else
{
switch (compareType)
{
case Comparer.EqualTo:
return(this.byteCompare.Compare(columnbytes, this.ValueBytes) == 0);
case Comparer.GreaterThan:
return(this.byteCompare.Compare(columnbytes, this.ValueBytes) > 0);
case Comparer.GreaterThanOrEqual:
return(this.byteCompare.Compare(columnbytes, this.ValueBytes) >= 0);
case Comparer.LessThan:
return(this.byteCompare.Compare(columnbytes, this.ValueBytes) < 0);
case Comparer.LessThanOrEqual:
return(this.byteCompare.Compare(columnbytes, this.ValueBytes) <= 0);
case Comparer.NotEqualTo:
return(!Btree.Comparer.ByteEqualComparer.isEqual(columnbytes, this.ValueBytes, columnLength));
case Comparer.StartWith:
return(Btree.Comparer.MoreComparer.StartWith(columnbytes, this.ValueBytes, this.columnLength));
case Comparer.Contains:
return(Btree.Comparer.MoreComparer.Contains(columnbytes, this.ValueBytes, this.columnLength, this.maxColumnLength));
default:
return(false);
}
}
}
public static object FromDateTimeBytes(byte[] bytes)
{
return(DateTimeUtcHelper.ToDateTime(bytes));
}
public static byte[] DateTimeToBytes(object value)
{
DateTime datetime = Convert.ToDateTime(value);
return(DateTimeUtcHelper.ToBytes(datetime));
}
public static DateTime ToDateTime(byte[] bytes)
{
return(DateTimeUtcHelper.ToDateTime(bytes));
}
public static byte[] ToBytes(DateTime value)
{
return(DateTimeUtcHelper.ToBytes(value));
}
